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THE GARDEN'S SECRETS !
What plant is this?
What plant is this?
Find out the answer on our Facebook page !
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NEWS
Christmas plants brought to light at the CJBG
Christmas plants brought to light at the CJBG.
Read the article HERE
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Gold medal for the CJBG's beekeeper
Gold medal for Christian Jenny, CJBG's beekeeper, at the Swiss apiary competition.
Read the article HERE
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Namoroka Maze Madagascar Documentary
Follow our scientists on a field trip to Madagascar ! Watch the documentary broadcasted on Arte.
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focus podcast Vidéos
Podcast Vidéos
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Symbol and Sensitivity - Winter prelude
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EXHIBITIONS

Symbols and feelings prelude
Symbol & Sensitivity
Winter prelude
Exhibition and
Sound & light performance
Until 3 Feb 2019
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The many lives of herbaria
Exhibition
Cabinet of curiosities
Until 1st of March 2020
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WORKSHOPS

the Green Workshops 2018-2019
GREEN WORKSHOPS 2018-2019
For children on Wednesday afternoon
Resuming in Spring 2019 !
Stay tuned !

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ombrage

Conservatoire et Jardin botaniques de la Ville de Genève


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Systematics of the lichen genus Usnea Adans.

The diversity of species, the taxonomy, the chorology, the ecology and the phylogeny of Usnea species is studied, particularly in Europe, Africa, North and South America.

Taxonomy and phylogeny of the Usnea species occuring in the tropical Andes (Bolivia, Colombia, Ecuador, Peru and Venezuela) and the Galapagos Islands, through the study of morphology, anatomy, chemistry, ecology and phylogenetics.

The taxonomy of the lichen genus Usnea in Europe remains poorly known. Numerous species have been described by Josef Motyka in his monograph "Lichenum Generis Usnea Studium Monographicum" published between 1936 et 1938. Environmental conditions can strongly influence the morphology of Usnea species and several of these species are now considered as morphotypes of the same species. Numerous characters used by Motyka in his identification keys are not diagnostic and leads to misleading identifications. This project aims to revise the taxonomy of European Usnea species, by providing detailed description of the species and their full (morphological, anatomical and chemical) intra-specific variation, together with a nomenclatural revision of the synonyms.

Taxonomy and systematics of the lichen genus Usnea in North America, through the study of morphology, anatomy, chemistry, and ecology.

A world checklist of the genus Usnea (Ascomycota, Parmeliaceae) is in preparation. Data on the status of the names (accepted names, synonyms, illeg. Names, etc.), on the protolog, on the type material (locality and herbarium) will be given.